Show me a 4.4 that hydro locked on line or utube there all 6cyl, Dude did you see the pic of his os . The guy tried to tape it up with foil and tape. Has to be a fool ,and whats funny is people let him touch there 5 .That's a huge vacume leak to start off .Basically try to restore to new is what I was saying .While looking for a 4.4 hydro locked motor I found a range rover utube tech that says to change the pcv (back of the intake plate )every 7000 miles must see video for any x5 owner with a v8!!!!